ipv4: add 'ipv4_dhcp_vendor_class_ifcfg' test
Add test, that 'ipv4.dhcp-vendor-class-identifier' option is translated to ifcfg as 'DHCP_VENDOR_CLASS_IDENTIFIER'
https://bugzilla.redhat.com/show_bug.cgi?id=1871042
@Build:master
Edited by Filip Pokryvka